Parmandur
Book-Friend, he/him
Notably, the DMG 2 was a disaster for WotC.4E tried that with the Dungeon Master's Guide 2, which had:
- Advice for storytelling techniques, such as failing forward, the "yes, and" technique, and vignettes.
- A section on collaborative homebrew setting creation ("yes, and" applied to letting players establish details about the world during a session).
- Sets of themed bolt-on abilities to help make different creatures feel like part of the same faction.
- New environmental effects to make combat more challenging.
- A set of interactive terrain rules (like rope swings and crumbling pillars that can be pushed over).
- Sidekick NPC rules.
That's what comes to mind immediately.